Water droplet moving across a wettability gradient
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- Опубликовано: 29 сен 2024
- Water droplet moving across a wettability gradient prepared by controlling the adsorption-kinetics of alkanethiols on a gold-coated surface.
For more information about research of the group of Surface Science and Technology at ETH Zürich: surface.mat.et...
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Any chance this could be repeated and this time, captured in HD?
hello, would love more from the surface-chemical gradient group
can you make perpetuum mobile on this effect?
for your next video I recommend the song titled "The Terrorist" by Dj Vadim
any way we could use this to make power?
Huge respect for crediting water for his role as droplet.
it was really an outstanding performance by water.
A fine actor who is really making waves.
@@stumbling Your pun makes me [sic].
@@stumbling i hate that pun so bad
Liked the video for crediting water
can't wait to do this in my nanotech class!
@Hey Girl I Like Your Kitchen Romania Buttfuck Magoo
Love the GameBoy music.
But is the water wet?
why is it doing this?
Why was this in my recommended?! I need answers…
Little known fact, water's part was unscripted and what we're seeing is alkanethiols on gold's genuine reaction, the director ended up liking the shot so much they kept it in.
You forgot the famous "Did you know?"
Reading this made me cringe so hard, 5 years were shaved off me life.
shut up,@Devwardhan Kothari, me boy.
@@brodylemmons9661 Rude
@@shivammishra-ic4ou Cap
Soon we will all be together through the algorithm.
Very soon now.
@@AtlasReburdened I can feel it gathering momentum
@@perfectstranger1152 Indeed.
the algorithm has brought me here
Maybe.
"Droplet: Water" Thanks. I'll cast him in my next movie. Awesome performance! Not even a stunt double used.
dont get Alec Baldwin,,,,LOL
It also played "The impossible".
Such a versatile actor
[Conservation of Energy] is actually absolutely fine, even though the center of mass actually does move upwards. This effect is caused by the adhesion force. A not entirely accurate yet very visual intuition is that the larger force of attraction from the higher-up material just pulls the droplet upwards. However, the further up the slope the drop is, the more energy would be required to remove it from the surface. So in effect, the drop still loses potential energy.
@UCzO06X9B7kXEmUa7xkqZueA explained but not in a top-level comment so here it is again for visibility.
I guess a simpler explanation could be in terms of hydrophilic hydrophobic gradients... Since molercular attractions are way stronger than gravitational potential energy
so basically, it has gravitational potential energy, as well as adhesion potential energy.
*whenever two objects are attracted, there's a potential energy gradient,* and since the water is attracted to the second potion of the wettability strip, it essentially has "adhesion potential energy", and it can be traded for "gravitational potential energy".
Wetting is like sticking magnets together. Force is necessary to remove liquid from a surface just like separating magnets.
Ok but couldn't you make a turn at the end so it would drop off and create perpetual motion?
@@XMooseManX It wouldn't fall. The attractive forces are greater than the pull of gravity as demonstrated in the video.
Amazing performance. Just amazing. Bravo to all involved, but, mostly, to the little water droplet that could.
Made this in my research lab back in 2013. Most of the time was spent getting those damn metal surfaces molecularly clean before applying the hydrophobic monolayers. We used diamond polish.
So basically like a magnet above pulling a metal upwards, but its not free energy because now you gotta find some energy to pull the metal off the magnet itself.
No m8, its not about magnets here. As the title calls... its about the surface adhesion gradient.
@@JaSkateJa If you want to get technical, I think adhesion is more or less an atomic scale of magnetism, but this isn't the point of the comment:
Once it's at the top, you still have to pull the water off of the high adhesion material at the top of the gradient. Much like when a magnet does work to pull itself into another magnet, you need some form of energy to separate them again, which is a totally fair comparison.
@@Genny207 There is no gradient on capillary plant walls?! You don´t need a gradient on plants to be able to transport water.
@@JaSkateJa The plane they drop the water onto, in this video, has a material on it which creates an adhesion gradient. That’s the gradient they’re talking about above.
@@server642 No, its not the material changing... its a surface edging changing over distance. Material stays the same ;)... as i said
Retired chemical engineer here. I am glad someone thought to do this and did it so well. My compliments to everyone involved.
I’ve just witnessed water flowing uphill. What a time to be alive!
Can we use this to flood the Russians?
I like how people saying perpetual motion because they don't understand anything while title literally explain everything.
Yes, sorcery.
In any case there is no such thing as "free energy".
I'm going to go out on a limb and guess most people don't know what "wettability" means.
I inferred it from "wettability gradient", but if someone would have asked me before then, I wouldn't have believed that was a real word.
I couldn't agree more, like 4u
if i am not mistaken, the title says nothing because this experiment would not work with water.... and using a word like "wettability" is not explaining :'D pretty sure most people dont know the word
I'd be tempted to just keep adding more and more drops of water to see how much it ends up holding and what sorts of interesting effects there are at critical points of surface tension vs. gravity.
The water deserves an academy award for it's performance moving upwards.
this is the first time i've heard the word "Wettability"
In fact there is a class of chemicals called "water wetters" or in other terms "surfactants" which break down surface tension and make water exhibit its "wetting" properties in a more profound way. Example, there are chemicals added to water in fire fighting tanks to allow the water to form smaller droplets making them more effective at putting out flames
@@hyfy-tr2jy so you're telling me water can be dry?
Also, wettability sounds like a term from a physiological study
Sounds like a woman's potential for mating.
@@BariumCobaltNitrog3n coepulaetion
Is there a manuscript detailing the process used to prepare this surface? Interested to know how specifically you can control the adsorption of alkanethiolates at Au with such spatial resolution. Seems counter-intuitive as we normally strive for a homogeneous SAM across the substrate. Though I suppose gradual emersion of the substrate over the assembly time would give a gradient eventually reaching monolayer coverage.
future phd right here boys
The answer is banana sir.
Technobabble
Was also curious about that, so I did a really quick diggin' into the literature and found this quite wonderful paper. Indeed gradual immersion is one way to do it, but other possibilities include e.g. diffusion of thiols through a polysaccharide matrix, and using an STM to do selective desorption of SAM thiols (you can make all kinds of patterns). See DOI:10.1021/la7033164, especially figure 2 (and reference no. 45 for the STM article, which is super cool).
EDIT: actually found another great article about this, but this time one of the authors is the same person that made the surface for this video (S. Morgenthaler)! DOI:10.1039/B715466F
@@mrgreenskypiano Soon, I hope!
Does the center of gravity of the droplet actually move upwards?
How does this behave in terms of conservation of energy?
Są inne siły niż grawitacja, myślę, że jest wykorzystywana zasada podobna do pozyskiwania wody z korzeni.
CoE is actually absolutely fine, even though the center of mass actually does move upwards. This effect is caused by the adhesion force. A not entirely accurate yet very visual intuition is that the larger force of attraction from the higher-up material just pulls the droplet upwards. However, the further up the slope the drop is, the more energy would be required to remove it from the surface. So in effect, the drop still loses potential energy.
@@captainunicode Thank you for the explanation, makes sense!
@@captainunicode So it's a bit like Velcro,- where initial contact causes more and more "pulleys" to bring it closer to the origin of pull.
I'm not a physicist, but in both cases you can see the shape of the drop along its point of contact changing. That's where the energy must be lost, in its surface tension. Even on the horizontal direction (not just when moving upwards) it has to change shape, because it takes energy to move the drop horizontally. What this video omitted is what happens if the surface slants downwards. In that case, and only that case, there's no reason for the drop's shape to change along its edge, because it doesn't take energy to move downhill. I wish they had included that clip.
Roll the credits!!!
Thanks everyone for your hard work! Couldn’t have made this huge motion picture without all of you!!
bro J.S. Bach/Glenn Gould nailed the music, absolute masterpiece
Water was scammed at the Oscars for not receiving Best Actor for his role as Droplet
Not long ago people would have called this witchcraft.
Except they still do and some idiot is about to start talking about conservation of energy and perpetual motion machines again.
Beautiful music. I have to say, I'm a _huge_ fan of this piece.
it sounds great! whats it called?
@@zek1405 JS Bach Goldberg Variations Nr. 3 :)
@@glennkrafczyk I was about to ask this. Thanks!
99% sure is the 1981 Glenn Gould recording, but would have to check
@@roflattheworld Sounds like the 1955 audio quality and speed, but I'm not 100% sure
Cool.
Also nice of you to credit water at the end.
0:39 me when someone thinks I'm too lazy to move up the wettability gradient on my own
Gotta love surface tension
One week ago this obscure video from 2016 had 18,206 views and today it has 214,718
98.111 views. I'll reload to see if the views changed
2 minutes later and we're still at 98.111 views. I'll take a whizz and see at how many views it has after that.
After I emptied my bladder I reloaded and took a look at the views again. We're at 98.249 now. My my, this is getting exciting! Will be back soon!
After practicing la campanella on piano for a bit, I came back to see the views are at a staggering 98.912! Amazing!
Using surface tension to climb
Best part is the credit for the music...
love how the materials used were in the credits
Indeed, he even listed Sarah Morgenthaler
All in comic sans
As an aspiring engineer i must tell you that we have to mention each chemical that we use in an experiment even if it is as basic as water. You know there are many transparant chemicals so they have to mention it.
*water droplet climbing a ramp*
300K people: _interesting_
ohh i’m actually here before the video blows up for once 😂
They did it. Free energy! About 0.00000000001 joules worth!
wettability gradient como estas bear real
i cant believe i just watched a drop of water moving across a wettability gradient
A bold move to not cast a famous celebrity as droplet, opting for the better fit water.
This is my church
This is where I heal my hurts
Water did great and all but I can't help see him as the baddie after his role in Titanic
In all my years never has the RUclips algorithm given me such a gem
reminds me of peter griffin falling down the stairs
And the Oscar for Best Actor goes to...Water!
gotta love the glenn gould goldberg variations
I'm so glad we have science so I can watch this at 3 am
thanks for crediting our friend Water
ah yes, 2016: the days of old 56K mp2 compression!!
***breathes in the nostalgia***
I assume the slow start of the droplet on the hill is because of a difference between the wettability gradient and the gravitational potential energy gradient?
This will have 3 million views by 2025
Gotta say, algorithm does its magic sometimes
I could make a meme out of this
Please do so!! :) #waterdroplet
Nice choice of music (Bach "Goldberg Variations")
recorded by glenn gould as well, very nice
So water can flow uphil 🤯
Interesting scientific video with proper methods.
COMIC SANS IN THE CREDITS
You’re a wizard Harry
does the water get colder after it moved on a gradient?
Nah, it falls into an adhesion well.
@@HotelPapa100 shouldnt it get colder tho? It does fall into adhesion well due to a fact it is liquid al has a surface tension, it does come from the fact its particles are kinetically bashing around.
I can imagine that this energy to move a droplet actually comes from its potential energy in a form of temperature.
@@grynsight The molecules on its surface kinda change state, by orienting themselves with regards to the surface of the substrate. It's almost as if the surface turns into a solid film. I'd regard the energy that is freed as similar to the latent energy that is freed when a liquid solidifies.
These state-changes are isothermic; the stochastic velocity of the molecules remains at the same distribution.
Ah, Glenn Gould. My favourite interpreter of Bach!
Love seeing the advancing contact angle drop as it goes up the gradient : )
This is also how solder flows on a heat gradient!
Cool. Ich bau in der wüste ein Waaserkraftwerk un lass das Wasser cyrkulieren.
💡
bro credited bach
Surface tension. It depends on the liquid and material in contact. Mercury tends to repel glass whereas water tends to stick to glass.
cohesive-adhesive forces
surface tension is the effect of cohesion.
Major props for playing the Goldberg Variations in the background.
hi mr algorithm
Why do I have the feeling this video's views and comments are about to blow up EXPONENTIALLY
Once the algorithm brings us back here in 5 years may everything actually be peaceful and NOT FUCKING 450 HISTORICAL EVENTS HAPPENING AT ONCE
Let’s see how many people the algorithm ropes in
Current views: 65,809
witchcraft
You got a like on the first example.
You would've gotten a second like from the second example, if it was possible!
I'll start putting music over my recordings too. Neurons spiking to the doom Soundtrack. That'll make conferences more fun
Now build a staircase ( jk, obviously wouldn't work. Or would it....? :D )
2016 is too late for this. Should've been from 2009 or something.
In the United States, a university would waste a 2 million dollar public grant from the government making something like this.
The unknown perfume oddly file because snowflake syntactically grab past a responsible pants. ready, needy ocelot
Good things , the Asiatic deserts are by now a thing of the past!
Gobi desert we are coming at you from the Depths of the Oceans !
Did you noticed that experiment who proves that Salt water passing through ultra Hydrophobic surfaces generated Electricity?!?!?!
Isn't that awesome ?!?!
Going to Gobi and with Class...
Good choice for the Goldenberg Variation.
Just one thing :
All this ideas come from a past so ancient the People who thought those first are by now already dead..
And they were all already feasible ideas...
Shame on everyone.
Wait, we’re allowed to post witchcraft you RUclips?
why are there so many comments that are just personifying inanimate objects???
"Someday the water simply decided to flow upwards. Turned out - George just kept filming all the time"
How about actually documenting this? Filming something and putting music over the top is poxy.
Five years youtube has been hiding water can go uphill? This whole time I thought water was lazy but I'm just gullible.
Ah, yes. The old "wettability" trope. How quaint.
Tbh, I expected a more solid performance after reading all the comments praising Mr. Water.
I don't exactly unterstand what this is, but I want one of those magic square thingy, i'm sold!
Dude I literally just found out about this phenomenon today at a conference talk. Google is scary.
Anyone know that specific Bach/Gould piece?
Nice principle but the comic sans font in the credits is really off-putting x'D
wonder if it's center of mass is actually moving uphill
Some vague and random Portal 2 vibes with that water sliding up that ramp >:)
Interesting but that music was trash. Sounded like it was being played by a kids music toy through a tin can.
TFW the algorithm straightup flexes on you.
Narrator: After years of struggle, Dihydrogen Monoxide got his big break after assuming a stage name
Water is very powerful, if you can prove however the surface you're filming on is perfectly level to begin with that is, assuming we know nothing about the centreweighted average of a cmos sensor . . . :D
Could you like, yk, make an infinite loop of moving water like that? Water would go up, fall, flow back and go up again?
That's almost like how they bought New York from the Indians, but then it was shiny watch bobbles and trinkets..
Bruh, yesterday I had a lecture about wettability and just now I got this recommended wth
got sent home from school because of floods, and here I am watching a 5 year old video with stock music and unbelievable black magic fuckery
this seems like something I would've come across in 2008 but it was posted so recently lol